An electronic database will be compiled consisting of data from each single patient of all enrolled trials, according to the guidelines for the performance of individual patient meta-analysis.(6-7-8). The database will include demographic data and baseline characteristics. Attention will be paid to clinical complications during transfer for early PCI and to the precise calculation of the following times-window: from symptoms onset to lytic therapy, from lytic therapy to early or rescue PCI, from randomization to all adverse events as defined below. Data will be checked for completeness and for consistency with published reports. Two investigators independently will extract all data, with disagreements resolved in consultation with a third investigator.